The camera Gidget wants to buy her dad that cost $79.95 is the equivalent of $650 in 2019.
John, played by Pete Duel, challenges Professor Lawrence's rationale that Gidget is too young to work at an adult nightclub by reminding him of Lolita, who is the titular character in a novel and subsequent movie about a middle-aged man sexually obsessed with an underage girl. The novel, first published in 1955, and the screenplay were written by Vladimir Nabokov. The movie, Lolita (1962), starred Sue Lyon in the title role.
Larue, played by David Norris, quotes the 'tangled web' passage from "Marmion"; specifically, from Canto VI, Stanza 17, in the epic poem written in 1808 by Walter Scott.